Features
> Home
> About
> History
> Instrument Shop
> Telescopes
Projects
> Double Stars
> OBSS
> FAME
> FTS
> ICRF
> ICRF-2
> UCAC
> VLBI
Catalogs
> Recommended
> AC2000
> ACT
> CPC2
> CPIRSS
> Double Stars
     -WDS
     -Orbit
     -Interferometric
     -Delta M
> ERLcat
> OID
> RORF
> RRFID
> TAC
> Tycho-2
> UCAC2
> VLBI
Miscellaneous
> Astronomy Events
Naval Meteorology and Oceanography Command U.S. Naval Observatory
Wednesday March 29, 2017

Home About History Instrument Shop Telescopes

USNO VLBI Intensive Solution i2007a

Presented here is the U.S. Naval Observatory's i2007a analysis of 1.5 hr dual-frequency VLBI sessions carried out under the auspices of the International VLBI Service (IVS) Intensive Program. UT1 angles are determined for each session between 2000 July 06 and 2007 February 25 using dual-frequency observations obtained at 8.4 GHz (X-band) and 2.2 GHz (S-band).

The SOLVE batch control file int2007a.cnt.gz was used to generate a least-squares solution with an output spool file int2007a.spl.gz. Note that this solution uses Calc10 (see calc10.ps). Tabulated below are the session values from this solution.

Earth Orientation Parameters

UT1 angle is determined for each session separately.

EOP time series, Solve format int2007a.eop.gz format description
EOP time series, EOB format int2007a.eob.gz format description
EOP time series, IVS format int2007a.eopi.gz format description

Comparisons

Differences of the i2007a UT1 angles with the IERS C04 UT1 angles.

Plot of i2007a minus IERS C04 PS JPG
   Linear Regression: bias = 10.6 +/- 0.6 micro-seconds at J2000
   Linear Regression: rate = -6.7 +/- 0.3 nano-seconds/day

   Residuals: w.r.m.s. = 14.7 micro-seconds
   Residuals: chi2/ndg =  2.77

Differences of the i2007a UT1 angles with the GSFC int19 UT1 angles.

Plot of i2007a minus gsfint19 PS JPG
   Linear Regression: bias = -3.4 +/- 0.8 micro-seconds at J2000
   Linear Regression: rate =  2.4 +/- 0.5 nano-seconds/day

   Residuals: w.r.m.s. = 6.7 micro-seconds
   Residuals: chi2/ndg = 0.26

Differences of the i2007a UT1 angles with the i2006c UT1 angles.

Plot of i2007a minus i2006c PS JPG
   Linear Regression: bias =  0.6 +/- 0.8 micro-seconds at J2000
   Linear Regression: rate = -0.4 +/- 0.4 nano-seconds/day

   Residuals: w.r.m.s. = 1.1 micro-seconds
   Residuals: chi2/ndg = 0.01

Please read this Privacy and Security Notice and this Disclaimer for External Links.

This is an Official U.S. Navy Web Site Need Help?